Early engines have 2 smaller holes at the front of the block that the pump & cover plate bolt to high mount pump. Later engines ('55 , 55.1 & up) have one larger hole at the front of the block, the pump mount into with 4 bolts to the block.
BC 1960 Chevy C10 driver 261 T5 4.10 dana 44 power loc 1949 GMC 250 project in waiting 1960 C60 pasture art Retired GM dealer tech. 1980 - 2022
